docs: def dataframe(self):
          """
          Returns a pandas DataFrame containing all other class properties and
          values. The index for the DataFrame is the string URI that is used to
          instantiate the class, such as '201802040nwe'.
          """
          if self._away_points is None and self._home_points is None:
              return None
          fields_to_include = {
              'attendance': self.attendance,
              'away_first_downs': self.away_first_downs,
              'away_fourth_down_attempts': self.away_fourth_down_attempts,
              'away_fourth_down_conversions': self.away_fourth_down_conversions,
              'away_fumbles': self.away_fumbles,
              'away_fumbles_lost': self.away_fumbles_lost,
              'away_interceptions': self.away_interceptions,
              'away_net_pass_yards': self.away_net_pass_yards,
              'away_pass_attempts': self.away_pass_attempts,
              'away_pass_completions': self.away_pass_completions,
              'away_pass_touchdowns': self.away_pass_touchdowns,
              'away_pass_yards': self.away_pass_yards,
              'away_penalties': self.away_penalties,
              'away_points': self.away_points,
              'away_rush_attempts': self.away_rush_attempts,
              'away_rush_touchdowns': self.away_rush_touchdowns,
              'away_rush_yards': self.away_rush_yards,
              'away_third_down_attempts': self.away_third_down_attempts,
              'away_third_down_conversions': self.away_third_down_conversions,
              'away_time_of_possession': self.away_time_of_possession,
              'away_times_sacked': self.away_times_sacked,
              'away_total_yards': self.away_total_yards,
              'away_turnovers': self.away_turnovers,
              'away_yards_from_penalties': self.away_yards_from_penalties,
              'away_yards_lost_from_sacks': self.away_yards_lost_from_sacks,
              'date': self.date,
              'duration': self.duration,
              'home_first_downs': self.home_first_downs,
              'home_fourth_down_attempts': self.home_fourth_down_attempts,
              'home_fourth_down_conversions': self.home_fourth_down_conversions,
              'home_fumbles': self.home_fumbles,
              'home_fumbles_lost': self.home_fumbles_lost,
              'home_interceptions': self.home_interceptions,
              'home_net_pass_yards': self.home_net_pass_yards,
              'home_pass_attempts': self.home_pass_attempts,
              'home_pass_completions': self.home_pass_completions,
              'home_pass_touchdowns': self.home_pass_touchdowns,
              'home_pass_yards': self.home_pass_yards,
              'home_penalties': self.home_penalties,
              'home_points': self.home_points,
              'home_rush_attempts': self.home_rush_attempts,
              'home_rush_touchdowns': self.home_rush_touchdowns,
              'home_rush_yards': self.home_rush_yards,
              'home_third_down_attempts': self.home_third_down_attempts,
              'home_third_down_conversions': self.home_third_down_conversions,
              'home_time_of_possession': self.home_time_of_possession,
              'home_times_sacked': self.home_times_sacked,
              'home_total_yards': self.home_total_yards,
              'home_turnovers': self.home_turnovers,
              'home_yards_from_penalties': self.home_yards_from_penalties,
              'home_yards_lost_from_sacks': self.home_yards_lost_from_sacks,
              'losing_abbr': self.losing_abbr,
              'losing_name': self.losing_name,
              'stadium': self.stadium,
              'time': self.time,
              'winner': self.winner,
              'winning_abbr': self.winning_abbr,
              'winning_name': self.winning_name
          }
          return pd.DataFrame([fields_to_include], index=[self._uri])